/Engine/Plugins/Online/OnlineSubsystem/Source/Public/OnlineKeyValuePair.h
Convert a singleFPropertyto anFVariantDatatrue if it was successful, false otherwise
static bool FPropertyToVariantData ( [FProperty](API\Runtime\CoreUObject\UObject\FProperty) * Property, const void * Value, int64 CheckFlags, int64 SkipFlags, [FVariantData](API\Plugins\OnlineSubsystem\FVariantData) & OutVariantData )